Do-it-yourself speedometer winding: scheme. How to wind up an electronic speedometer?

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

Car mileage is the main indicator of technical condition. It can be used to judge whether the car needs urgent maintenance or not. It occupies an important role in the field of automotive sales in the secondary market. Everyone who is interested in buying a used car, first of all, asks the seller how far he has covered. It's good if you come across a responsible seller who does not use speedometer windings. But that doesn't happen often.

The distance traveled, several hundred or thousands of kilometers long, can tell a lot about a car. Are its components intact, is there a need to replace consumables, or can we wait for now? The lower the mileage reading, the higher the price can be requested. Some owners do not go to any tricks in order to sell the car as profitably as possible for themselves. What is this ingenious invention and is it easy to make it yourself?

Forcedreasons

There are a lot of people who want to make a small adjustment to the mileage readings. This suggests that the phenomenon is quite widespread. In this case, each owner will be able to find a worthy explanation for his act. Basically, everything is attributed to a faulty speedometer or the need to replace the instrument panel.

But to be completely honest, the main reason for winding up the speedometer is the desire, at least to some extent, to rejuvenate your car. And, as a rule, making the necessary adjustments is done for the purpose of further sale. The so-called pre-sale preparation. After all, it is much easier and more pleasant to sell or buy a car with low mileage.

Both parties win: both the seller, who filled the price, and the buyer, who, it seems, received a relatively new car. Therefore, the topic of mileage cheating is the most discussed among a large number of former and future vehicle owners.

In addition to those who want to reduce mileage, there are those who, on the contrary, try to increase it. These are mainly drivers of commercial vehicles or vehicles used for service. There is also an excuse for this, and on the one hand it is quite reasonable.

Those fuel consumption rates that the accounting department of almost any enterprise takes into account cannot cover the real costs of gasoline or diesel fuel. And winding the speedometer allows you to solve the problem to some extent, since the amount of the compensation that is duewhen using a personal vehicle, is mainly able to cover only the cost of fuel. That's just depreciation and depreciation of the car are not taken into account. In this connection, many drivers take such a forced measure.

Speedometer and odometer

Everyone knows perfectly well what a speedometer is. This is a device that shows the speed of the car at any given time. But there is also such a thing as an odometer. Someone has already heard this term and knows what it is about, but not everyone is able to understand what kind of device it is. Meanwhile, it serves to measure the distance traveled by the car.

In fact, the speedometer is a combined device that combines a speed meter and a mileage meter from the date of issue. In some cars, in addition to the odometer, there is another device - a daily mileage counter. To reset it, a special button is provided (something like speedometer winding).

Since the odometer is mounted directly into the speedometer, many drivers often refer to these two devices with a common word - the speedometer. Which is not entirely true, because the function of the speedometer is to measure the speed of the car, and the odometer measures the distance traveled by it.

Varieties and principle of operation of speedometers

There are different types of distance and speed meters in cars, but there are generally two main varieties:

• mechanical (analog);
• electronic (digital);
• electromechanical (combined).

Mechanical speedometers are also divided into several types and can be:

• centrifugal;
• chronometric;
• vibrating.

Electromechanical devices are divided into electromagnetic and induction. It is important to know this, since the use of one or another do-it-yourself speedometer winding scheme depends on it. Indications, regardless of the type of device, are displayed in km / h, and in the USA - mph (miles per hour). How exactly is speed measured?

There are innovative speedometers that can determine the speed of a car using a satellite positioning system (GPS, GLONASS). However, such systems are not installed at the factories and are rather an additional option, which significantly increases the comfort for drivers.

Mechanical speedometer

The principle of operation of the device in cars with rear-wheel drive: the speedometer calculates the speed readings from the output shaft of the gearbox. In this case, the accuracy of the readings is affected by the size of the tires, the gear ratio of the rear axle gearbox and the inherent error of the device.

To measure speed in front-wheel drive vehicles, the speedometer relies on the left wheel drive. Here, in addition to the error of the device and the size of the tires, the so-called effect of the rounding of the road influences the readings. That is, when entering a left turn, the speed will be less than rectilinear movement. If the car turns right, then the speed is reversedwill be slightly enlarged. The do-it-yourself mechanical winding of a speedometer is not so complicated, as will be clear later.

Electronic speedometer

Almost every modern car is equipped with an electronic speedometer. Perhaps, after a certain time, it will completely replace mechanical counterparts, but so far they are still present even in new models. The principle of operation of an electronic device is simpler than that of a mechanical speedometer.

Often, an electronic device has a magnet in its device, which is attached to the output shaft of the gearbox. The magnet rotates with the shaft, and the electronic unit is located nearby. At the same time, rotating in a circle on the gearbox shaft, the magnet periodically passes in close proximity to the electronics, transmitting a signal to it and thereby performing the function of a sensor.

And every time the magnet passes the block, it sends a pulse to the speedometer. Inside the meter there is a so-called black box (characterized by increased ingenuity), which calculates the speed from these impulses. To wind up the speedometer, this knowledge will not hurt.

There is nothing easier to understand: the faster the pulse frequency, the faster the box shaft rotates. All calculations are performed with maximum accuracy and have almost zero error.

Errors

It happens that metering devices fix the wrong speed of the car. On the one hand, it's even good when the speedometer shows slightly increased readings. In this case, the driver will observe the speed limit and notwill receive a fine. And manufacturers are calm, and drivers do not violate traffic rules.

Another thing is if the device, on the contrary, underestimates the real speed. Then many companies would simply go bankrupt on the numerous lawsuits from drivers, which indicate that incorrect speedometer readings were the cause of fines or accidents.

Why do mistakes happen? The fact is that this device is not very accurate, since the rotation of the car wheel is mainly used to determine the speed. This takes into account its diameter, and this parameter is not stable. It is important to know this when deciding how to wind an electronic or mechanical speedometer.

Speedometers on many modern cars have an average error of 10% at a speed of 200 km/h. But the relationship is non-linear. That is, at a speed of 110 km / h, the difference with the real one can be 5-10 km / h. But if you go slower (up to 60 km / h), then the error is so small that it is impossible to feel it.

Cost calculation

For many, the issue price is a fundamental factor in almost everything: purchases, services, and so on. In this connection, it is reasonable to ask yourself the question of what the speedometer adjustment, which is so necessary in some cases, will cost. Here, as in the course of any work in auto repair shops, everything depends on the complexity of its implementation and volume.

It's not that difficult to mess around with mechanical speedometers, all you need to do is rotate the mechanism drive in a certain direction. Wouldtime, and desire is always there. However, with electronic metering devices, everything is much more complicated than it might seem. This requires basic knowledge of the electrical equipment of the car. And in some cases, one cannot do without the knowledge and skills of a programmer.

Currently, in many stores that have their own website, you can buy a speedometer winder with winding speed adjustment. There are different options on sale, and any car owner will get what they want.

The first electronic speed meters recorded mileage readings on an internal memory, which made it relatively easy to adjust the values. In many modern cars, the necessary information is duplicated among the electronic units of different systems (ECU, brake, lighting, immobilizer, etc.). This data is highly encrypted.

In order to carry out the procedure correctly, it is necessary to edit the data wherever they are. This significantly complicates the matter, besides, it is necessary not to affect the important indicators of other systems. If you turn to a non-professional, then you should prepare for the purchase of some new part, perhaps more than one. In addition, the work itself will cost a lot.

As for the cost of a competent adjustment, the prices vary significantly and depend not only on the brand of the car, but also on the year of production. For example, for a UAZ Patriot car, the price can start from 1,500 rubles. Owners of a new Land Rover car will have to shell out 15,000 rubles. There are companies in which the price for such work can reach 25,000rubles. It might be worth getting a speedometer winding circuit with adjustable winding speed and do it yourself.

Twisting a mechanical speedometer

If there is no extra money or desire to entrust your car to strangers, you can do everything yourself. True, with mechanical devices, as mentioned above, it is not difficult to mess around, there would be time. To do this, it is worth disconnecting the cable of the device from the box and fixing it on the shaft of some kind of motor. A drill would work too, which would be even better.

After choosing a direction, start twisting. It will take a lot of time, due to the high gear ratio of the gearbox. You can use another way - to dismantle the odometer, then using a special tool and brute force, set the required readings.

Wiring an electronic device

To correct the readings of electronic instruments, you must use special equipment and computer programs. You need to know exactly where to look for data, which is difficult. But often all the information is collected in one place.

The winding of the electronic speedometer is carried out by reprogramming the current data of the vehicle blocks. In this case, you can use one of several connection methods:

• directly to the data schema;
• through the connector in the dashboard;
• via the diagnostic connector.

Rewinding an electronic speedometer is a complex procedure that borders on certain risks. Despite this, it is quite often used, because you can significantly increase the cost of the car, which only plays into the hands of sellers.

Can speedometer twist be detected?

It all depends on the type of device. If this is an electromechanical or mechanical device, then it is enough to look under the car and inspect the gearbox drive. In the presence of dirt and unusual traces, it can be concluded that the speedometer readings have been corrected. If the drive is clean, then with a high probability everything is normal. It is already a proven fact that 50% of the total number of vehicles put up on the secondary market have incorrect mileage readings.

If the car has an electronic speedometer, then it is already more difficult to detect outside interference. But it’s also not easy to connect the winding of the speedometer in this case (at least some consolation). It is simply impossible to do without an experienced master and special equipment. Often, in auto repair shops, tags with accurate mileage data are attached to the car. This is done during maintenance or after replacing parts of the fuel system. It is worth comparing the data from the tags and the speedometer readings. If they match, then there is nothing to worry about, otherwise there is a possibility of fraud.